In a certain breed of dogs, black hair is dominant and brown hair is recessive. if two parents are heterozygous for black hair, what is the probability that their offspring will be black?

(it`s not 50%, my second guess is 1/4? )

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

c. movement because i took the test and it lets me review my answers